fix(feed): give the view switcher the keyboard model its menu role promises

Arrows/Home/End move a roving focus and Escape hands focus back to the
trigger — the menu unmounts under the focused item, which stranded focus
on <body>. Outside-click deliberately does not refocus: that would steal
focus from whatever was just clicked.

frontend/src/lib/feedView.ts

@@ -4,9 +4,10 @@
 export type FeedView = "cards" | "rows";
 
 export const FEED_VIEWS: readonly FeedView[] = ["cards", "rows"] as const;
-export const FEED_VIEW_DEFAULT: FeedView = "cards";
 
-export function isFeedView(v: unknown): v is FeedView {
+const FEED_VIEW_DEFAULT: FeedView = "cards";
+
+function isFeedView(v: unknown): v is FeedView {
   return typeof v === "string" && (FEED_VIEWS as readonly string[]).includes(v);
 }
 

frontend/src/lib/storage.ts

@@ -17,8 +17,10 @@ export const LS = {
   defaultViewFilters: "siftlode.defaultViewFilters",
   page: "siftlode.page",
   perfMode: "siftlode.perfMode",
-  // The feed's view mode (see lib/feedView.ts). A local cache of the server pref, so the feed
-  // renders in your chosen view on first paint instead of flashing the default.
+  // The feed's view mode (see lib/feedView.ts) — a cache of the server pref, so a reload of an
+  // established tab paints your view straight away. A brand-new tab still starts on the default
+  // until /api/me lands: the account isn't pinned yet (App pins it once meQuery resolves), so
+  // the per-account key can't be read.
   feedView: "siftlode.feedView",
   channelFilter: "siftlode.channelFilter",
   channelsView: "siftlode.channelsView",